MEXICO CITY (AP) — Mexico City officials said Sunday they are pursuing all lines of investigation into the killing of a photojournalist whose body was found along with four slain women in the capital, where he had fled because of harassment in the state he covered.

The Nigerian army has freed 178 people being held hostage by Boko Haram jihadists including more than 100 children, it said, as it carries out a regional offensive aimed at rooting out the insurgency. "During the offensive operations, 178 people held captives by the terrorists were rescued, they include 101 children, 67 women and 10 men respectively," army spokesman Colonel Tukur Gusau said in a statement. The rescue took place near Aulari about 70 kilometres (40 miles) south of Maiduguri, the biggest town in northeast Nigeria, he said, without specifying when the operation was conducted.